"It's getting louder," announced Innis.

Indeed the sound was now more plainly to be heard.

Paul gave a quick glance upward.

"Look, fellows!" he exclaimed. "An airship!"

The sound was right over their heads now, and as all three looked
up they saw, soaring over them, a large biplane, containing three
figures. It was low enough for the forms to be distinguished
clearly.

"Some airship!" cried Dick, admiringly.

"And making time, too," remarked Innis.

Aircraft were no novelties to the cadets. In fact part of the
instruction at Kentfield included wireless, and the theoretical use
of aeroplanes in war. The cadets had gone in a body to several
aviation meets, and once had been taken by Major Franklin Webster,
the instructor in military tactics, to an army meet where several
new forms of biplanes and monoplanes had been tried out, to see
which should be given official recognition.

"I never saw one like that before," remarked Paul, as they watched
the evolutions of the craft above them.

"Neither did I," admitted Dick.